Consider Griffith's experiment. If he observed healthy mice after injecting these animals with dead virulent and living non-virulent bacteria, what could he have concluded?
a. Genetic information cannot be transferred between mice.
b. Genetic information cannot be transferred between bacteria.
c. Genetic information is transferrable.
d. The RNA of the bacteria used in this experiment was degraded.
e. None of the above.
Ans: b. Genetic information cannot be transferred between bacteria.
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Industrial melanism involving the peppered moths (Biston sp.) is cited as an example of natural selection that has been observed in the last one hundred years. Recall that the peppered moth exhibits two distinct morphological types with dark and light colored wings. Which of the following statements about changes in these two types of moths as a result of industrial melanism is true?
A. The dark forms are selected against in nonpolluted forests. B. The dark forms are distasteful to birds and are thus safe in polluted forests. C. The light forms are selected against in nonpolluted forests. D. Birds prey more on the dark forms in polluted forests E. Dark forms emigrate from nonpolluted forests to polluted forests.
The disaccharide in the accompanying figure is ____
a. lactose b. fructose c. maltose d. cellulose e. sucrose
The outer layer of gray matter that covers the cerebral hemispheres is called the cerebral
A. cortex B. callosum C. meninx D. fissure
Forests help to regulate the global climate by
A) releasing oxygen B) absorbing carbon dioxide C) absorbing pollutants D) emitting ozone E) preventing soil erosion